Lithium Battery Electrolyte Additive for High-Temperature Stability

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Solution Overview

Problem

Lithium secondary batteries face safety issues due to the volatility and flammability of organic electrolytes, particularly at high temperatures, and struggle to maintain high capacity retention rates across temperature extremes.

Innovation Solution

A novel compound represented by Chemical Formula 1 is used as an additive in the electrolyte, which includes a heterocycloalkyl structure with two oxygen atoms and carbonyl-substituted carbon atoms, enhancing stability by forming a solid electrolyte interface film and improving high-temperature and low-temperature characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic electrolytes are used in lithium secondary batteries, then the battery can operate, but safety problems occur due to volatility and flammability at high temperatures

Engineering Contradiction:

ImprovesafetyVSAvoidvolatility and flammability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a novel compound as an intermediary substance that mediates between the electrode and the organic electrolyte. This compound forms a protective interface layer that prevents direct contact between the reactive organic electrolyte and the electrode, thereby eliminating the harmful effects of volatility and flammability while maintaining battery operation

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful volatility and flammability of organic electrolytes into a beneficial protective mechanism. The novel compound utilizes the inherent reactivity of the organic electrolyte to form a stable solid electrolyte interface film, transforming the harmful chemical reactivity into a protective barrier that enhances safety

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Productivity

If organic electrolyte is used to enable battery operation, then charge and discharge function is achieved, but capacity retention deteriorates at temperature extremes

Engineering Contradiction:

Improvecharge and discharge capabilityVSAvoidcapacity retention

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent changes the chemical composition parameters of the electrolyte system by introducing a novel compound with specific molecular structure (containing heteroatoms such as O, N, S). This parameter change modifies the properties of the solid electrolyte interface film to achieve stable capacity retention across a wide temperature range while maintaining charge and discharge functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system combining the novel compound with conventional organic electrolytes. This composite approach leverages the benefits of both components: the conventional electrolyte provides ionic conductivity for charge and discharge, while the novel compound forms a stable protective interface that ensures capacity retention at temperature extremes

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The electrolyte with the novel compound exhibits high capacity recovery rates at elevated temperatures, low thickness change rates, and excellent discharge capacity at low temperatures, ensuring stability and performance across a wide temperature range.

Implementation Method 1

a coating film referred to as a solid electrolyte interface (SEI) film is formed on a surface of the anode

Methodology Applied

Scientific EffectSolid electrolyte interface (SEI) film formation:

Implementation Method 2

while a surface of carbon particles, which is an anode active material, and an electrolyte react with each other

Methodology Applied

Scientific EffectElectrochemical reaction:

Implementation Method 3

lithium ions released from a lithium metal oxide, which is a cathode, move to a carbon electrode, which is an anode

Methodology Applied

Scientific EffectIon transport:

Implementation Method 4

to thereby be intercalated into carbon

Methodology Applied

Scientific EffectIntercalation:

Implementation Method 5

The lithium secondary battery, which generates electrical energy by oxidation-reduction reactions when lithium ions are co-intercalated into and deintercalated from an anode and a cathode

Methodology Applied

Scientific EffectOxidation-reduction reaction: Redox Reactions

Data Source

PatentUS9742032B2Compound and electrolyte of lithium secondary battery containing the same

Publication Date: 2017.08.22 SK ON CO LTD

AI summary

Provided are a novel compound, an electrolyte for a lithium secondary battery containing the same, and a lithium secondary battery containing the electrolyte for a lithium secondary battery according to the present invention. The electrolyte for a secondary battery according to the present invention may have significantly excellent high-temperature stability, low-temperature discharge capacity, and life cycle characteristics.